Nor did one go in below (7)

I believe the answer is:

neither

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'nor did' is the definition.
I can't tell whether this defines the answer.

'one go in below' is the wordplay.
'one' becomes 'i' (Roman numeral).
'go in' is an insertion indicator.
'below' becomes 'nether' (I've seen this before).
'i' placed within 'nether' is 'NEITHER'.

Can you help me to learn more?

(Other definitions for neither that I've seen before include "Not one of two" , "None of the two" , "Negative word" , "Also not" , "Therein lies not one or the other" .)

I've seen this clue in the Evening Standard.

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